JP5912926B2 - Mobile communication system, serving gateway apparatus, and mobile communication method - Google Patents

Description

  The present invention relates to a mobile communication system, a serving gateway apparatus and a mobile communication method capable of connecting a specific call processed with priority over a general call.

  Long Term Evolution (LTE) defines Voice over LTE (VoLTE), which enables connection of voice communication calls via an Internet protocol (IP) -based network (IP-Connectivity Access Network (IP-CAN)) Has been. In VoLTE, a procedure for handling a highly urgent emergency call such as transmission to the police or fire department with the highest priority is defined (for example, see Non-Patent Document 1).

  FIG. 1 shows a communication sequence when a mobile station (UE) issues an emergency call. As shown in FIG. 1, when an emergency call is made by a UE, a PDN Connectivity Request for requesting connection to a packet data network (PDN) is sent from the UE to a Mobility Management Entity (MME) according to the UE requested PDN connectivity procedure. (S10). The PDN Connectivity Request includes information (Request type: emergency) indicating that the request type is urgent. Based on the PDN Connectivity Request, the serving gateway device (S-GW), the PDN gateway device (P-GW), and the policy / billing control device (PCRF) execute processing for connecting emergency calls (S20). ~ 80).

  Specifically, the S-GW transmits and receives CC Request and CC Answer to and from the PCRF in order to determine the quality of service applied to the communication bearer set between the radio base station (eNB) and the S-GW. (S40, S50). Further, the S-GW transmits a binding update request (Proxy Binding Update) for requesting an IP address binding update for the UE to the P-GW (S60). The P-GW transmits and receives CC Request and CC Answer to and from the PCRF in order to determine the quality of service applied to the communication bearer set between the S-GW and the P-GW (S70, S80).

  The CC Answer sent by the PCRF to the P-GW in step S80 is added with the contents of the ARP based on the Bearer QoS_ARP (Allocation and Retention Policy) included in the CC Request received from the S-GW in step S40. . Thereafter, the P-GW preferentially executes the setting of the communication bearer.

  In addition, when a priority call sent by a priority user (UE) determined by a contract is preferentially processed over a general call sent by a general user (UE), the procedure is almost the same as that of an emergency call. It is prescribed. FIG. 2 shows a communication sequence when a mobile station (UE) of a priority user sends a voice communication call (priority call). As shown in FIG. 2, when a voice communication call is made by the UE, PDN Connectivity that requests an Attach Request or PDN connection to a radio access network (LTE) according to the Attach procedure or UE requested PDN connectivity procedure Request is transmitted from UE to Mobility Management Entity (MME) (S110). The MME that has received the Request refers to the subscriber profile of the UE that has transmitted the Request, and determines the content of the ARP set for the UE (S120). The MME transmits a setting request (Create Session Request) including information indicating that the quality of service (QoS) of the communication bearer used for connection of the priority call is a priority to the S-GW (S130). Based on the setting request, the S-GW, the P-GW, and the PCRF execute a process for connecting to the priority call (S140 to S180).

3GPP TS 23.401 V11.0.0 Subclause 5.10.2 UE requested PDN connectivity, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ( Release 11), December 2011

  However, the conventional emergency call and priority call processing procedures described above have the following problems. That is, the P-GW binds the IP address related to the UE based on the binding update request (Proxy Binding Update) transmitted from the S-GW according to PMIP (Proxy Mobile IP) and the CC Answer transmitted from the PCRF. Executes processing, but priority is given to the setting of the corresponding communication bearer when CC Answer with ARP urgent or priority is received from PCRF that determines the service quality provision policy for the user (UE) as a whole mobile communication system Run it.

  For this reason, there is a possibility that a delay occurs until it is determined that a specific call such as an emergency call or a priority call should be processed with priority, and the connection of the specific call may fail.

  Therefore, the present invention has been made in view of such a situation, and provides a mobile communication system, a serving gateway apparatus, and a mobile communication method that can connect specific calls such as emergency calls and priority calls more quickly and reliably. Objective.

  A first feature of the present invention is a mobile communication system that includes a serving gateway device and a PDN gateway device, and is capable of connecting a specific call that is processed with priority over other general calls originated by a mobile station. The serving gateway device includes: a setting request acquisition unit that acquires a setting request for a communication bearer used for connection of the specific call from a mobility management device; and the specific call included in the setting request acquired by the setting request acquisition unit. A binding update request including specific call information capable of identifying the specific call in response to a service control response received from the service quality policy determination apparatus in accordance with the setting request. A binding update request unit to be transmitted to the gateway device, wherein the PDN gateway device includes Based on the specific call information included in the binding update request received from the gateways device, the gist in that it comprises a binding processing unit which processes in preference to binding update request of the general call the binding update request.

  A second feature of the present invention is a serving gateway apparatus included in a mobile communication system capable of connecting a specific call processed with priority over other general calls originated by a mobile station, wherein the connection of the specific call is performed A setting request acquisition unit that acquires a setting request of a communication bearer used in the mobile management device, and the setting request based on the quality of service information of the specific call included in the setting request acquired by the setting request acquisition unit. And a binding update request unit that transmits a binding update request including specific call information that can identify the specific call to the PDN gateway apparatus in response to a service control response received from the service quality policy determination apparatus. Is the gist.

  According to a third aspect of the present invention, there is provided a mobile communication method for connecting a specific call processed with priority over other general calls transmitted by a mobile station, wherein the serving gateway device is connected to the specific call. Acquiring a setting request for a communication bearer to be used from a mobility management device; and, based on the service quality information of the specific call included in the acquired setting request by the serving gateway device, the service quality accompanying the setting request Transmitting a binding update request including specific call information capable of identifying the specific call to the PDN gateway apparatus in response to a service control response received from the policy determining apparatus; and the PDN gateway apparatus includes the serving Based on the specific call information included in the binding update request received from the gateway device. There are, and summarized in that comprising the step of processing in preference to the binding update request of the general call the binding update request.

  According to the features of the present invention, it is possible to provide a mobile communication system, a serving gateway apparatus, and a mobile communication method that can connect specific calls such as emergency calls and priority calls more quickly and reliably.

It is a figure which shows the conventional communication sequence in case a mobile station transmits an emergency call. It is a figure which shows the conventional communication sequence in case a priority user's mobile station transmits a voice communication call (priority call). 1 is an overall schematic configuration diagram of a mobile communication system 10 according to an embodiment of the present invention. It is a functional block block diagram of S-GW50 which concerns on embodiment of this invention. It is a functional block block diagram of P-GW60 which concerns on embodiment of this invention. It is a figure which shows the communication sequence regarding the connection of the emergency call using Bearer QoS_ARP which concerns on embodiment of this invention. It is a figure which shows the communication sequence regarding the connection of the emergency call using Emergency Indicator which concerns on embodiment of this invention. It is a figure which shows the communication sequence regarding the connection of the priority call using Bearer QoS_ARP which concerns on embodiment of this invention. It is a figure which shows the communication sequence regarding the connection of the priority call using High Priority Indicator which concerns on embodiment of this invention.

  Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(1) Overall Schematic Configuration of Mobile Communication System FIG. 3 is an overall schematic configuration diagram of the mobile communication system 10 according to the present embodiment. As shown in FIG. 3, a mobile station 20 (hereinafter referred to as UE20), a radio base station 30 (hereinafter referred to as eNB30), a mobility management device (hereinafter referred to as MME40), a serving gateway device 50 (hereinafter referred to as S-GW50), a PDN gateway device 60 (hereinafter referred to as P-GW60) and a policy / billing control device (hereinafter referred to as PCRF70). The mobile communication system 10 may include a home subscriber server (HSS), and the P-GW 60 includes an IP-based external network (packet data network) such as an IP multimedia core network subsystem (IMS). Connected. In the present embodiment, the PCRF 70 constitutes a service quality policy determination device.

  The MME 40 is an exchange that accommodates the eNB 30 and provides mobility control, bearer control functions, and the like. The S-GW 50 is a visited packet switch that accommodates a 3GPP (LTE) access system. The P-GW 60 is a connection point with the IMS platform, and is a packet switch that performs IP address assignment, packet transfer to the S-GW 50, and the like. Further, the P-GW 60 executes QoS control, bearer setting control, and the like in cooperation with the PCRF 70. The PCRF 70 is a logical node that executes control for QoS and charging for user data transfer.

  The mobile communication system 10 can connect a specific call that is processed with priority over other voice communication calls (general calls) originated by the UE 20. Specifically, the specific call includes an emergency call such as a call to the police or a fire department, and a priority call sent by a priority user UE defined in a contract or the like.

(2) Functional Block Configuration of Mobile Communication System Next, a functional block configuration of the mobile communication system 10 will be described. FIG. 4 is a functional block configuration diagram of the S-GW50. FIG. 5 is a functional block configuration diagram of the P-GW 60.

(2.1) S-GW50
As shown in FIG. 4, the S-GW 50 includes a setting request acquisition unit 51, a service control request transmission unit 53, and a binding update request unit 55.

  The setting request acquisition unit 51 acquires from the MME 40 a setting request for a communication bearer used for connection of a specific call (emergency call or priority call). Specifically, the setting request acquisition unit 51 receives a Create Session Request that requests setting of a communication bearer set between the eNB 30 and the S-GW 50 from the MME 40. Create Session Request includes Bearer QoS_ARP (Allocation and Retention Policy) which is a priority applied to the communication bearer. Alternatively, Create Session Request may include Emergency Indicator or High Priority Indicator (specific call identifier) indicating an emergency call or priority call.

  The service control request transmission unit 53 transmits a service control request to the PCRF 70 based on the Create Session Request acquired by the setting request acquisition unit 51. Specifically, the service control request transmission unit 53 transmits a CC (Credit Control) Request for requesting the setting of the quality of service applied to the communication bearer described above to the PCRF 70 in response to the Create Session Request received from the MME 40. .

  The CC Request includes information (for example, for emergency calls and priority calls) indicating quality of service (QoS) applied to the communication bearer.

  Further, the service control request transmission unit 53 can also transmit a CC Request including an Emergency Indicator or High Priority Indicator (specific call identifier) indicating an emergency call or a priority call to the PCRF 70.

  The binding update request unit 55 receives the CC received from the PCRF 70 along with the Create Session Request based on the quality of service (QoS) information of the specific call included in the Create Session Request (setting request) acquired by the setting request acquiring unit 51. In response to Answer (service control response), a binding update request is sent to P-GW60. Specifically, the binding update request unit 55 performs an operation according to PMIP (Proxy Mobile IP), and includes specific call information that can identify a specific call according to the CC Answer received from the PCRF 70. Send Proxy Binding Update to P-GW60.

  The binding update request unit 55 can use, as the specific call information, service quality information indicating that the service quality applied to the communication bearer described above is higher than that of a general call. Specifically, an ARP in which Bearer QoS_ARP, which is a priority applied to the communication bearer, is higher than that of a general call can be used as specific call information.

  In particular, in the present embodiment, the binding update request unit 55 can use a specific call identifier indicating a specific call as specific call information. Specifically, Emergency Indicator or High Priority Indicator is included in Proxy Binding Update. The Emergency Indicator and the High Priority Indicator may be a 1-bit flag, or may clearly indicate the type of emergency call or priority call using a plurality of bits.

  The binding update request unit 55 transmits Proxy Binding Update including Emergency Indicator or High Priority Indicator to the P-GW 60.

(2.2) P-GW60
As shown in FIG. 5, the P-GW 60 includes a binding processing unit 61. The binding processing unit 61 processes the Proxy Binding Update with priority over other voice communication calls (general calls) based on the specific call information included in the Proxy Binding Update (binding update request) received from the S-GW50. To do.

  Specifically, the binding processing unit 61, based on Bearer QoS_ARP included in Proxy Binding Update, Emergency Indicator or High Priority Indicator, based on Proxy Binding Update including the specific call information UE 20 Priority is given to binding processing such as IP address.

(3) Operation of Mobile Communication System Next, the operation of the mobile communication system 10 will be described. Specifically, a communication sequence related to connection of an emergency call and a priority call that is a voice communication call processed with priority over other general calls will be described.

(3.1) Operation example 1 (emergency call / Bearer QoS_ARP)
FIG. 6 shows a communication sequence related to emergency call connection using Bearer QoS_ARP. In the following, portions different from the conventional communication sequence shown in FIG. 1 will be mainly described, and descriptions of portions similar to the conventional communication sequence will be omitted as appropriate.

  As shown in FIG. 6, the S-GW 50 receives a Create Session Request in which Bearer QoS_ARP is set to “emergency” from the MME 40 (S230). This process is the same as in the prior art. The S-GW 50 determines that the Bearer QoS_ARP is urgent, and holds the ARP and the communication bearer information in association with each other.

  The S-GW 50 transmits a CC Request to the PCRF 70, receives CC Answer from the PCRF 70, and then transmits a Proxy Binding Update including information in which Bearer QoS_ARP is set to “emergency” to the P-GW 60 (S260).

  Based on the Bearer QoS_ARP included in the Proxy Binding Update, the P-GW 60 preferentially executes a binding process such as an IP address related to the UE 20 that has made the emergency call (S270). As a result, processing up to the connection of the emergency call is executed with priority over other general calls.

(3.2) Operation example 2 (Emergency call / Emergency Indicator)
FIG. 7 shows a communication sequence related to emergency call connection using Emergency Indicator. As shown in FIG. 7, the S-GW 50 receives the Create Session Request including the Emergency Indicator from the MME 40 with the Bearer QoS_ARP set to “emergency” (S330). The S-GW 50 determines that the voice communication call is urgent based on the Emergency Indicator (or Bearer QoS_ARP), and holds the Emergency Indicator (or ARP) and the communication bearer information in association with each other.

  The S-GW 50 transmits a CC Request including the Emergency Indicator to the PCRF 70 (S340). The PCRF 70 preferentially executes processing related to service control of the corresponding communication bearer based on the Emergency Indicator included in the CC Request received from the S-GW 50 (S345).

  After receiving CC Answer from PCRF 70, S-GW 50 transmits Proxy Binding Update including Emergency Indicator to P-GW 60 (S360).

  Based on the Emergency Indicator included in the Proxy Binding Update, the P-GW 60 preferentially executes a binding process such as an IP address related to the UE 20 that has made the emergency call (S370). As a result, processing up to the connection of the emergency call is executed with priority over other general calls.

(3.3) Operation example 3 (priority call / Bearer QoS_ARP use)
FIG. 8 shows a communication sequence related to connection of priority calls using Bearer QoS_ARP. In the following, portions different from the conventional communication sequence shown in FIG. 2 will be mainly described, and description of portions similar to those of the conventional communication sequence will be omitted as appropriate.

  As shown in FIG. 8, the S-GW 50 receives a Create Session Request in which Bearer QoS_ARP is set to “priority” from the MME 40 (S430). This process is the same as in the prior art. The S-GW 50 determines that the Bearer QoS_ARP is urgent, and holds the ARP and the communication bearer information in association with each other.

  The S-GW 50 transmits a CC Request to the PCRF 70 and receives a CC Answer from the PCRF 70, and then transmits a Proxy Binding Update including information in which Bearer QoS_ARP is set to “priority” to the P-GW 60 (S460).

  Based on the Bearer QoS_ARP included in the Proxy Binding Update, the P-GW 60 preferentially executes a binding process such as an IP address related to the UE 20 that has transmitted the priority call (S470). As a result, processing up to the connection of the priority call is executed with priority over other general calls.

(3.4) Operation example 4 (priority call / high priority indicator)
FIG. 9 shows a communication sequence related to connection of a priority call using the High Priority Indicator. As shown in FIG. 9, the S-GW 50 receives the Create Session Request including the High Priority Indicator from the MME 40 with the Bearer QoS_ARP set to “priority” (S530). The S-GW 50 determines that the voice communication call has priority based on the High Priority Indicator (or Bearer QoS_ARP), and holds the High Priority Indicator (or ARP) and the information on the communication bearer in association with each other.

  The S-GW 50 transmits a CC Request including the High Priority Indicator to the PCRF 70 (S540). The PCRF 70 preferentially executes processing related to service control of the corresponding communication bearer based on the High Priority y Indicator included in the CC Request received from the S-GW 50 (S545).

  After receiving CC Answer from PCRF 70, S-GW 50 transmits Proxy Binding Update including High Priority Indicator to P-GW 60 (S560).

  Based on the High Priority Indicator included in the Proxy Binding Update, the P-GW 60 preferentially executes a binding process such as an IP address related to the UE 20 that has made the priority call (S570). As a result, processing up to the connection of the priority call is executed with priority over other general calls.

(4) Operation / Effect According to the mobile communication system 10, a Proxy Binding Update including specific call information that can identify a specific call (emergency call or priority call) is transmitted from the S-GW 50 to the P-GW 60. . Further, based on the specific call information included in the Proxy Binding Update, the P-GW 60 processes the Proxy Binding Update including the specific call information in preference to the general call binding update request. For this reason, the possibility that the connection of a specific call fails can be greatly reduced. Further, the P-GW 60 can preferentially process the setting of the communication bearer related to the specific call without waiting for the completion of CC Request / CC Answer transmission / reception between the P-GW 60 and the PCRF 70. That is, according to the mobile communication system 10, specific calls such as emergency calls and priority calls connected by VoLTE can be more quickly and reliably connected.

  Further, in the present embodiment, the S-GW 50 transmits a CC Request including Emergency Indicator or High Priority Indicator (specific call identifier) to the PCRF 70. For this reason, the specific call processing in the PCRF 70 is also preferentially executed. For this reason, it is possible to further reduce the delay until the connection of the specific call and the possibility that the connection of the specific call fails.

  In this embodiment, as described above, Proxy Binding Update is transmitted and received according to PMIP. In PMIP, Proxy Binding Update is transmitted via a communication bearer set between S-GW50 and P-GW60. The quality of service (QoS) information that is sent and received is notified to the P-GW 60 from the PCRF 70, setting of the communication bearer between the eNB 30 and the S-GW 50 used for connection of a specific call, setting of the service quality, Are executed by different messages (Proxy Binding Update and ARP). Even in such a case, setting of the communication bearer between the eNB 30 and the S-GW 50 can be executed with priority.

(5) Other Embodiments As described above, the content of the present invention has been disclosed through one embodiment of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. should not do. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the S-GW 50 transmits a CC Request including Emergency Indicator or High Priority Indicator to the PCRF 70, but such processing is not necessarily essential. In the above-described embodiment, the voice communication call according to VoLTE has been described as an example. However, the application range of the present invention is not limited to the voice communication call. For example, the concept of an emergency call or a priority call can be considered in data communication. For example, in the case of a priority user based on contract information, the above-described voice communication call and data communication call are handled with priority over general user calls (general calls). The emergency call is generally only a voice communication call, but an emergency data communication service concept is also conceivable. For example, it is conceivable to acquire location information of a mobile station that has made an emergency call (voice communication) or to acquire data stored in the mobile station.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  The present invention may be expressed as follows. The first feature of the present invention includes S-GW50 (serving gateway device) and P-GW60 (PDN gateway device), and is processed with priority over other general calls originated by UE20 (mobile station). The mobile communication system 10 is capable of connecting emergency calls and priority calls (specific calls), and the serving gateway device sends a Create Session Request (communication bearer setting request) used for connection of the specific calls to the MME 40 (mobile The setting request acquisition unit 51 (setting request acquisition unit) acquired from the management device) and the setting based on Bearer QoS_ARP (service quality information) of the specific call included in the setting request acquired by the setting request acquisition unit Specific call information (for example, Emergency Indicator) that can identify the specific call according to the CC Answer (service control response) received from the PCRF 70 (service quality policy determination device) in response to the request A binding update request unit 55 (binding update request unit) that transmits a Proxy Binding Update (binding update request) to the PDN gateway device, and the PDN gateway device receives the binding update request received from the serving gateway device. And a binding processing unit 61 (binding processing unit) that processes the binding update request in preference to the binding update request for a general call based on the specific call information included in the call.

  In the first feature of the present invention, the binding update request unit uses Bearer QoS_ARP (service quality information) indicating that the quality of service applied to the communication bearer is higher than that of the general call as the specific call information. The binding update request may be transmitted.

  In the first feature of the present invention, the binding update request unit transmits the binding update request using Emergency Indicator or High Priority Indicator (specific call identifier) indicating the specific call as the specific call information. Also good.

  In the first aspect of the present invention, the serving gateway device may include a service control request transmission unit that transmits a CC Request (service control request) including the specific call identifier to the service quality policy determination device.

  A second feature of the present invention is a serving gateway apparatus included in a mobile communication system capable of connecting a specific call processed with priority over other general calls originated by a mobile station, wherein the connection of the specific call is performed A setting request acquisition unit that acquires a setting request of a communication bearer used in the mobile management device, and the setting request based on the quality of service information of the specific call included in the setting request acquired by the setting request acquisition unit. And a binding update request unit that transmits a binding update request including specific call information that can identify the specific call to the PDN gateway apparatus in response to a service control response received from the service quality policy determination apparatus. Is the gist.

  According to a third aspect of the present invention, there is provided a mobile communication method for connecting a specific call processed with priority over other general calls transmitted by a mobile station, wherein the serving gateway device is connected to the specific call. Acquiring a setting request for a communication bearer to be used from a mobility management device; and, based on the service quality information of the specific call included in the acquired setting request by the serving gateway device, the service quality accompanying the setting request Transmitting a binding update request including specific call information capable of identifying the specific call to the PDN gateway apparatus in response to a service control response received from the policy determining apparatus; and the PDN gateway apparatus includes the serving Based on the specific call information included in the binding update request received from the gateway device. There are, and summarized in that comprising the step of processing in preference to the binding update request of the general call the binding update request.

10 ... Mobile communication system
20 ... UE
30 ... eNB
40 ... MME
50 ... S-GW
51 ... Setting request acquisition unit
53 ... Service control request transmitter
55: Binding update request part
60 ... P-GW
61 ... Binding processing part
70… PCRF

Claims (6)

A mobile communication system that includes a serving gateway device and a PDN gateway device and is capable of connecting a specific call that is processed with priority over other general calls originated by a mobile station,
The serving gateway device is:
A setting request acquisition unit that acquires a setting request of a communication bearer used for connection of the specific call from a mobility management device;
Based on the service quality information of the specific call included in the setting request acquired by the setting request acquisition unit, in response to a service control response received from the service quality policy determination apparatus along with the setting request, the specific call A binding update request unit that transmits a binding update request including specific call information that can be identified to the PDN gateway device;
The PDN gateway device includes a binding processing unit that processes the binding update request in preference to the binding update request for a general call based on the specific call information included in the binding update request received from the serving gateway device. A mobile communication system provided.   The binding update request unit transmits the binding update request with service quality information indicating that the quality of service applied to the communication bearer is higher than that of the general call as the specific call information. Mobile communication system.   The mobile communication system according to claim 1, wherein the binding update request unit transmits the binding update request with the specific call information indicating a specific call identifier indicating the specific call.   The mobile communication system according to claim 3, wherein the serving gateway apparatus includes a service control request transmission unit that transmits a service control request including the specific call identifier to the service quality policy determination apparatus. A serving gateway apparatus included in a mobile communication system capable of connecting a specific call processed with priority over other general calls originated by a mobile station,
A setting request acquisition unit that acquires a setting request of a communication bearer used for connection of the specific call from a mobility management device;
Based on the service quality information of the specific call included in the setting request acquired by the setting request acquisition unit, in response to a service control response received from the service quality policy determination apparatus along with the setting request, the specific call A serving gateway apparatus comprising: a binding update request unit that transmits a binding update request including specific call information capable of identifying the presence to a PDN gateway apparatus. A mobile communication method for connecting a specific call processed in preference to other general calls originated by a mobile station,
The serving gateway device acquires a communication bearer setting request used for connection of the specific call from a mobility management device;
Based on the service quality information of the specific call included in the acquired setting request, the serving gateway apparatus receives the service call response from the service quality policy determination apparatus according to the setting request. Transmitting a binding update request including specific call information that can be identified to the PDN gateway device;
The PDN gateway device processing the binding update request in preference to the general call binding update request based on the specific call information included in the binding update request received from the serving gateway device. Mobile communication method.

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